当我试图加载我的windows phone 8应用程序导航到另一个页面时出错

每次运行App.xaml页面时，它都会将我带到该页面。然后显示下面的错误:

// Code to execute if a navigation fails
private void RootFrame_NavigationFailed(object sender, NavigationFailedEventArgs e)
{
    if (Debugger.IsAttached)
    {
        // A navigation has failed; break into the debugger
        Debugger.Break();
    }